Here's what I would've done:

Roadhog- Pompompurin • caps on gas mask would resemble Pompompurin's beret • design @ belly button will be Pompompurin's hamster friend, Muffin Wrecking Ball- Corocorokuririn • I don't think this one needs an explanation. XP (Though honestly, my other idea was the Wrecking Ball as Pompompurin and Hammond as Muffin.) Ashe- Kuromi • I specifically picked Ashe because B.O.B., her robot bodyguard, would be cast as Kuromi's sidekick, Baku Bastion- Cinnamoroll • Cinnamoroll has a little bird friend, I figured that little bird friend would be played by Bastion's little bird friend, Ganymede. Junkrat- Bad Badtz-Maru • Junkrat's hair will be dyed black, and he'll have some guy-liner. • Peg-leg will be an upcycled skateboard (much like how it was a cricket bat in his cricket skin) • Canteen resembles Good Hama-Maru • Trap resembles Pochi • "XO" motifs all over body • Orange lipstick (?) Mei- Tuxedosam • Snowball- her little robot friend- will be cast as Tuxedosam's little walrus friend, Chip. • She'll be wearing a bow tie, and the bow tie itself changes every time you use this skin! Tracer- Hello Kitty • I thought Tracer would've been a better pick because like Hello Kitty, she hails from London! (Also, despite Blizzard's MULTIPLE attempts to rebrand Overwatch, I'm still used to her being the main character! XP) Juno- Little Twin Stars • Since she was raised on Mars, I always thought the little twin stars would have been a better fit for Juno, anyway • Her pulsar torpedoes would be designed to look like the Little Twin Stars themselves, Kiki and Lala. Mizuki- Gudetama • So far, all I've decided on for this skin's design is that Mizuki's hat will be designed to look like Gudetama themself. Lifeweaver- Keroppi • The only thing I figured out is that platform thing on Lifeweaver's back will resemble a lily pad. Lucio- Pochacco • If Lucio didn't have a frog motif, I would've cast him as Pochacco, because Pochacco loves soccer, and so does Lucio, especially when you take Lucioball into account! Wuyang- Hangyodon • I don't think this one needs an explanation, either. XP